By Elwyn R Berlekamp

ISBN-10: 9814635898

ISBN-13: 9789814635899

This can be the revised variation of Berlekamp's well-known booklet, "Algebraic Coding Theory", initially released in 1968, in which he brought numerous algorithms that have to that end ruled engineering perform during this box. this type of is an set of rules for deciphering Reed-Solomon and Bose–Chaudhuri–Hocquenghem codes that for this reason turned often called the Berlekamp–Massey set of rules. one other is the Berlekamp set of rules for factoring polynomials over finite fields, whose later extensions and gildings grew to become generic in symbolic manipulation platforms. different novel algorithms more suitable the fundamental equipment for doing quite a few mathematics operations in finite fields of attribute . different significant learn contributions during this publication incorporated a brand new classification of Lee metric codes, and special asymptotic effects at the variety of info symbols in lengthy binary BCH codes.

chosen chapters of the ebook grew to become a typical graduate textbook.

either practising engineers and students will locate this publication to be of serious value.

Readership: Researchers in coding thought and cryptography, algebra and quantity thought, and software program engineering.

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If the algorithm starts with a pair of large numbers, this list of partial results may run to a considerable length. 11. 11 P-2 = 0 q_2 = 1 Given r-2 and r_1• Define P-1 = 1 q_1 = 0 and then compute ak, rk, Pk, and qk by the rules = akrk-1 + r~c 0 ~ r~c Pk = a~cPk-1 + Pk-2 q" = a~cqk-l + q1c-2 r~c-2 < r1c-1 Stop when rn = 0. _1)P~c - (ak+lPk + PkTk-1 + Pk-1)q,. pk-1 - pkqk-1 = ( -1)" Upon applying these formulas with k = n, we haver,. 12) Furthermore, we can make certain statements about the magnitudes of Pn-1 and qn-1· Since a,.

Page 2 March 3, 2015 6:6 Algebraic Coding Theory (Revised Edition) 9in x 6in b2064-ch02 ARITHMETIC OPERATIONS MODULO AN IRREDUCIBLE BINARY POLYNOMIAL 23 Since the r's form a decreasing sequence of nonnegative integers, they must eventually terminate when, for some n, rn = 0. ) The weakness of this method is that all the partial results ao, ro, a1, r1, . . , an-1, 1'n-1 must be remembered in order to compute the desired multipliers bo and b-1. If the algorithm starts with a pair of large numbers, this list of partial results may run to a considerable length.

We begin by constructing certain codes to correct single errors, the Hamming codes. The syndrome of a linear code is related to the error pattern by the equation s 1 = XE 1• In general, the right side of this equation may be written as E1 times the first column of the X matrix, plus E2 times the second column of the X matrix, plus Ea times the third column of the X matrix, plus . For example, if 1 1 0 1 0 0] s' = [ 1 0 1 0 1 0 [El,E2,Ea,E4,Eo,Es]' 0 1 1 0 0 1 then [::J ~ E,m + E, m+E. m +E. m The syndrome is thus seen to be the sum of those columns of the X matrix where channel errors occur.

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